Police shot an Alzheimer's sufferer with a Taser during a struggle because he refused to go into care.
The 59-year-old farmer was shot with the stun gun after struggling with three officers who were trying to help section him under the Mental Health Act, according to Humberside Police.
He ripped the barbed darts out and had to be restrained further until more officers arrived at the scene in Epworth, North Lincolnshire.
Two officers suffered minor injuries in the incident on March 6 in which police were responding to a call for help from a doctor.
The use of a Taser on someone with dementia is "very alarming" and must have been "particularly distressing", the Alzheimer's Society said.
Sarah Moody, locality manager for the Alzheimer's Society, said: "The Alzheimer's Society is very alarmed at the use of a Taser gun on a vulnerable person with early onset dementia, which must have been a particularly distressing experience for the gentleman concerned.
"People with dementia can sometimes exhibit extreme agitation which can be difficult to understand and cope with for those who encounter it.
"This unfortunate incident illustrates a lack of understanding in society of dementia and the best way to support and help people who are affected by this devastating condition."
Chief Superintendent David Hilditch, of Humberside Police, described the incident as "very sad".
He said: "Our police officers and PCSOs have a variety of difficult situations to deal with on a day-to-day basis and are trained to tackle a variety of different situations.
"It's very sad that this gentleman had to be restrained through the use of a Taser but the officers were faced with a significant level of violence.
"It is to their credit that they successfully restrained the 59-year-old man without injury to himself and took him to a place of safety to be treated."